From 37a90ac2f6960b9006ccd23966ed510116cb937a Mon Sep 17 00:00:00 2001
From: Apoorva Ranade <apoorvaranade02@gmail.com>
Date: Fri, 7 May 2021 20:32:06 +0530
Subject: [PATCH] Optimization

---
 src/main/java/chocopy/pa3/CodeGenImpl.java | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/main/java/chocopy/pa3/CodeGenImpl.java b/src/main/java/chocopy/pa3/CodeGenImpl.java
index d13182c..192854b 100644
--- a/src/main/java/chocopy/pa3/CodeGenImpl.java
+++ b/src/main/java/chocopy/pa3/CodeGenImpl.java
@@ -42,6 +42,8 @@ public class CodeGenImpl extends CodeGenBase
     protected final Label initcharsLabel = new Label("initchars");  
     protected final Label allCharsLabel = new Label("allChars");
       
+    /** Variable to indicate if Strings are used in the program for optimization */
+    private boolean flag = false;
 
     /** Operation on None. */
     private final Label errorNone = new Label("error.None");
@@ -454,6 +456,7 @@ public class CodeGenImpl extends CodeGenBase
         @Override
         public Register analyze(StringLiteral node) 
         {
+            flag=true;
             Label l = constants.getStrConstant(node.value);
             backend.emitLA(Register.A0, l, "Load string literal");
             return Register.A0;
@@ -498,6 +501,8 @@ public class CodeGenImpl extends CodeGenBase
         
         private Object getVar(Identifier id)
         {
+            if(id.getInferredType().equals(Type.STR_TYPE))
+                flag=true;
             SymbolInfo info = sym.get(id.name);
             if(info instanceof StackVarInfo)
                 return getStackVar((StackVarInfo)info);
@@ -1145,9 +1150,13 @@ public class CodeGenImpl extends CodeGenBase
         emitStdFunc("strneql");
         emitStdFunc("makeint");
         emitStdFunc("makebool");
-        emitStdFunc("initchars");
-        emitStdFunc("allChars");
-
+        if(flag)
+        {
+            emitStdFunc("initchars");
+            emitStdFunc("allChars");
+        }
+        else
+            emitStdFunc("dummy");
         emitErrorFunc(errorNone, "Operation on None");
         emitErrorFunc(errorDiv, "Division by zero");
         emitErrorFunc(errorOob, "Index out of bounds");